Kate Silverton says her second pregnancy at the age of 43 is 'beyond a miracle'.
The BBC presenter is due to give birth in two months after beating fertility problems by conceiving naturally.
Kate and husband Mike Heron were amazed when she fell pregnant without treatment with first child Clemency - born in 2011. They had lost hope after four unsuccessful rounds of IVF.
Kate told Hello! magazine: "To be blessed with baby number two seems beyond a miracle.
"It seems it's also beyond the doctors' understanding, too. It's simply amazing and we are so excited."
She and Mike have had years of setbacks in their efforts to have children and were both amazed when she became pregnant with their first child Clemency naturally after the unsuccessful IVF cycles.
She said: " "I have felt such utter joy in motherhood that I just wanted the chance to do it all over again.
"Despite my limited chances, I thought it was worth trying again. I just wanted to have one more try naturally and see what happened."
It has not been straightforward and she has had two miscarriages after Clemency's birth.
Kate hopes she will be able to provide support for others who have difficulty conceiving in the future.
She said: "I think it helps for women and their partners to be able to talk openly about what they are going through and to know they're not alone, and that even with the tough times there can always be hope.
"Mike and I struggled to have children for the last seven years. Now it feels as if we're coming to the fruition of a long but lovely journey. I would love to know that there are others out there who are able to do the same."
• The full interview is in the new edition of Hello! which is out now.
On April 28, Kate spoke to ITV about her second pregnancy. You can read more here.
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